Patent GB-441930-A (GB)
Title: Improvements relating to liquid measuring and dispensing apparatus
IPC: G01F15/07
Filed: 1934-07-28
Abstract: 441,930. Liquid-dispensing apparatus. AVERY-HARDOLL, Ltd., and FRASER, J., Avery House, Clerkenwell Green, London. July 28, 1934, No. 22077. [Class 116] In liquid-dispensing apparatus in which the quantity delivered is measured by a flow meter, the delivery of liquid is automatically cut off when any predetermined quantity within the capacity of the indicating mechanism has been delivered and automatic means is provided for zeroizing the indicating mechanism at each delivery operation in combination with means which, on actuation, result in the initiation of the zeroizing operation, the bring- ing into action of the predetermining mechanism and the starting of the motor which drives the pump. At the beginning of a delivery operation a pointer 86 is moved to a position on its dial corresponding to the amount of liquid to be delivered by a knob 85 which rotates a shaft 84 carrying a setting wheel 83 of which the accurate setting is determined by an associated pawl 88. The delivery operation is initiated by actuating an arm 50 which through levers 49, 48 rotates a shaft 28 carrying a toothed quadrant 51 controlling through arms 54, 56 a three-armed member 57a, 57b, 57c. The arm 57b engages a pin 58, Fig. 3, on a plate 61 secured to the sleeve of a quadrant 27 which, after release from a detent 63, continues its rotation under the action of a spring 60, wound during the initial movement of the shaft 28. An arm 46 secured to the arm 27b of the quadrant is connected to an arm 47 operating the switch of the electric motor driving the pump. The quadrant 27 rotates a pinion 17c, Fig. 2, on a sleeve 17, capable of slight axial movement which is effected by the meshing of a pinion 17b with a toothed quadrant 19 rotatable against the action of a dashpot 24. The axial movement of the sleeve 27 presses a friction member 17a against the clutch face 15a of a shaft 15 which, during the further rotation of the sleeve 17, zeroizes the fraction pointer and through arms 40, 41 effects the zeroization of the unit pointers. The movement of the plate 61, Fig. 3, rocks an arm 64 connected to a lever 65 which initially moves a lever 78 forwardly until a peg 81 carried by the lever engages the surface of the setting wheel 83. Subsequent movement of the arm 64 causes the lever 65 to rotate on a pivot on the lever 78 and to rock a lever 67, and a shaft 68 carrying an arm 70 which opens the valve against the action of its spring 73. When the zeroizing operation has been completed the quadrant 19 moves the sleeve 17 to the position in which the clutch faces 15a, 17a are separated and the clutch faces 13, 16 and 29a, 33a are brought into engagement so that the pointer shafts 15, 31 are driven from the spindle 7 of the liquid meter. When the rod 78 carrying the peg 81 is moved to the right, a normally loose pinion 94, Fig. 2, on the shaft 84 of the .setting wheel is clamped between the setting wheel 83 and a collar 92 so that the shaft 84 is driven from the sleeve 30, through pinions 94, 95. The predetermined amount of liquid having been delivered, and the wheel 83 correspondingly rotated, the peg 81 passes into the hole 82, and its movement to the right partially closes the valve 71a which is finally closed when a pawl 99, secured to a lever 98 connected to the rod 78, falls into a depression 35a on a cam 35 mounted on the shaft 15. In the initial closing stage of the valve 71a, Fig. 3, the annular piston 74 is forced against a disc 76, having an axial aperture, which gradually moves to the right against the liquid in the end portion of the casing 69 under the action of a spring 75. Liquid flowing past the main valve until it is finally closed passes through an aperture 74a in the annular portion of the valve 74. The motor is shut off by returning the handle 50 to its normal position, the arm 57c engaging the pin 58 to restore the quadrant 27 to locking relationship with the detent 63. Specifications 426,266 and 426,267 are referred to.